2.10.2.: Classification criteria A pyrophoric solid shall be classified in a single category for this class using test N.2 in Part III, sub-section of the ►M4  UN RTDG ◄ , Manual of Tests and Criteria in accordance with Table 2.10.1:

Table 2.10.1

Criteria for pyrophoric solids




The solid ignites within 5 minutes of coming into contact with air.


The test shall be performed on the substance or mixture in its physical form as presented. If, for example, for the purposes of supply or transport, the same chemical is to be presented in a physical form different from that which was tested and which is considered likely to materially alter its performance in a classification test, the substance shall also be tested in the new form.